Diagnose why an x402 payment did not convert from quote to settled response: missing X-PAYMENT header, payTo/network/amount mismatch, wallet spend-cap block, verify failure, settle failure, or post-payment response delivery issue. This deterministic endpoint can inspect a live quote without payin...
AI agents use gpt55_x402_payment_failure_doctor to commit financial operations through GPT 5 5 x402 Low Cost Agent Tools — usually the final step of a payment, billing, or trading workflow. A call moves real money.
| Parameter | Type | Required | Description |
|---|---|---|---|
url | string | — | |
body | object | — | |
method | string | — | |
status | integer | — | |
endpoint | string | — | |
resource | string | — | |
timeout_ms | integer | — | |
errorMessage | string | — | |
settleStatus | integer | — | |
verifyStatus | integer | — | |
error_message | string | — | |
expectedPayTo | string | — |
Parameters from the server's own tool schema.
Although the primary function is diagnostic (inspecting x402 payment failures), the tool itself requires a real cryptocurrency payment (USDC on Base or Solana) to invoke. Each call commits a financial transaction of up to $0.006, making this a Financial category tool.
From the tool's definition Pay up to $0.006 per request with x402 USDC on Base or choose the fixed-price Solana USDC option when advertised. Exact fixed-price payment and Base upto token-metered payment are both accepted
Risk signalsAccepts URL/endpoint input (url) · Accepts raw HTML/template content (body) · High parameter count (39 properties)
Attacks that exploit this kind of access
Diagnose why an x402 payment did not convert from quote to settled response: missing X-PAYMENT header, payTo/network/amount mismatch, wallet spend-cap block, verify failure, settle failure, or post-payment response delivery issue. This deterministic endpoint can inspect a live quote without paying the target endpoint and never sends a payment header to the target service. Pay up to $0.006 per request with x402 USDC on Base or choose the fixed-price Solana USDC option when advertised. Exact fixed-price payment and Base upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Canonical live prices: https://gpt55.558686.xyz/x402/live-prices.json. It is categorised as a Financial tool in the GPT 5 5 x402 Low Cost Agent Tools MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
gpt55_x402_payment_failure_doctor accepts 12 parameters: url, body, method, status, endpoint, resource, timeout_ms, errorMessage, settleStatus, verifyStatus, error_message, expectedPayTo. The full parameter table on this page comes from the server's own tool schema.
Register the GPT 5 5 x402 Low Cost Agent Tools MCP server in PolicyLayer and add a rule for gpt55_x402_payment_failure_doctor: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches GPT 5 5 x402 Low Cost Agent Tools. Nothing to install.
gpt55_x402_payment_failure_doctor is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the gpt55_x402_payment_failure_doctor rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for gpt55_x402_payment_failure_doctor. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
gpt55_x402_payment_failure_doctor is provided by the GPT 5 5 x402 Low Cost Agent Tools MCP server (https://gpt55.558686.xyz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
gpt55_x402_payment_failure_doctor is one line of GPT 5 5 x402 Low Cost Agent Tools's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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